The database is divided into three groups of records (e, f, and m), corresponding to the three medications that the subjects received. Within each group, the data from a single subject are represented by a pair of records (baseline and on-therapy; note that the database includes a few subjects that are represented by only one record each).

Record names are of the form dnnnx. The first character, d, indicates which of the three medications under study was to be given to the subject:

• e: Encainide
• f: Flecainide
• m: Moricizine

• a: baseline (pre-treatment; no medication)
• b: on-therapy (during medication)

Thus, for example, record f004b is from a subject receiving Flecainide, and the corresponding baseline data for the same subject is in record f004a.

The .atr files are annotation files that contain a label for each QRS complex, indicating its type and time of occurrence. The RR interval time series can be obtained by reading these files using software such as ann2rr; see the RR Intervals, Heart Rate, and HRV Howto for further information.

The .hea files contain additional information about the recordings that may be of interest, including the subject's age range (in 5-year quantiles) and gender, a note about the type of recording (indicating if it is flutter-compensated), the time of day at which the recording began, and a recording date. Note that for purposes of deidentification, the true recording date is not provided. For each subject, a randomly chosen offset has been applied to the baseline and on-therapy record dates (the same offset is applied to both dates, so that the interval between the recordings is correct). The fictitious recording dates given are close enough to the true dates that it should still be possible to study, for example, seasonal variations of variables of interest in this database.

A list in plain text form of the names of the 1543 records in this database can be found here.

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